/*
  *   Copyright (C) International Business Machines Corp., 2000-2003
  *
  *   This program is free software;  you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
  *   the Free Software Foundation; either version 2 of the License, or
  *   (at your option) any later version.
  *
  *   This program is distributed in the hope that it will be useful,
  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  *   the GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
  *   along with this program;  if not, write to the Free Software
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 #ifndef _H_JFS_FILSYS
 #define _H_JFS_FILSYS
 
 /*
  *      jfs_filsys.h
  *
  * file system (implementation-dependent) constants
  *
  * refer to <limits.h> for system wide implementation-dependent constants
  */
 
 /*
  *       file system option (superblock flag)
  */
 
 /* directory option */
 #define JFS_UNICODE     0x00000001      /* unicode name */
 
 /* mount time flags for error handling */
 #define JFS_ERR_REMOUNT_RO 0x00000002   /* remount read-only */
 #define JFS_ERR_CONTINUE   0x00000004   /* continue */
 #define JFS_ERR_PANIC      0x00000008   /* panic */
 
 /* Quota support */
 #define JFS_USRQUOTA    0x00000010
 #define JFS_GRPQUOTA    0x00000020
 
 /* mount time flag to disable journaling to disk */
 #define JFS_NOINTEGRITY 0x00000040
 
 /* commit option */
 #define JFS_COMMIT      0x00000f00      /* commit option mask */
 #define JFS_GROUPCOMMIT 0x00000100      /* group (of 1) commit */
 #define JFS_LAZYCOMMIT  0x00000200      /* lazy commit */
 #define JFS_TMPFS       0x00000400      /* temporary file system -
                                          * do not log/commit:
                                          * Never implemented
                                          */
 
 /* log logical volume option */
 #define JFS_INLINELOG   0x00000800      /* inline log within file system */
 #define JFS_INLINEMOVE  0x00001000      /* inline log being moved */
 
 /* Secondary aggregate inode table */
 #define JFS_BAD_SAIT    0x00010000      /* current secondary ait is bad */
 
 /* sparse regular file support */
 #define JFS_SPARSE      0x00020000      /* sparse regular file */
 
 /* DASD Limits          F226941 */
 #define JFS_DASD_ENABLED 0x00040000     /* DASD limits enabled */
 #define JFS_DASD_PRIME  0x00080000      /* Prime DASD usage on boot */
 
 /* big endian flag */
 #define JFS_SWAP_BYTES  0x00100000      /* running on big endian computer */
 
 /* Directory index */
 #define JFS_DIR_INDEX   0x00200000      /* Persistent index for */
 
 /* platform options */
 #define JFS_LINUX       0x10000000      /* Linux support */
 #define JFS_DFS         0x20000000      /* DCE DFS LFS support */
 /*      Never implemented */
 
 #define JFS_OS2         0x40000000      /* OS/2 support */
 /*      case-insensitive name/directory support */
 
 #define JFS_AIX         0x80000000      /* AIX support */
 
 /*
  *      buffer cache configuration
  */
 /* page size */
 #ifdef PSIZE
 #undef PSIZE
 #endif
 #define PSIZE           4096    /* page size (in byte) */
 #define L2PSIZE         12      /* log2(PSIZE) */
 #define POFFSET         4095    /* offset within page */
 
 /* buffer page size */
 #define BPSIZE  PSIZE
 
 /*
  *      fs fundamental size
  *
  * PSIZE >= file system block size >= PBSIZE >= DISIZE
  */
 #define PBSIZE          512     /* physical block size (in byte) */
 #define L2PBSIZE        9       /* log2(PBSIZE) */
 
 #define DISIZE          512     /* on-disk inode size (in byte) */
 #define L2DISIZE        9       /* log2(DISIZE) */
 
 #define IDATASIZE       256     /* inode inline data size */
 #define IXATTRSIZE      128     /* inode inline extended attribute size */
 
 #define XTPAGE_SIZE     4096
 #define log2_PAGESIZE   12
 
 #define IAG_SIZE        4096
 #define IAG_EXTENT_SIZE 4096
 #define INOSPERIAG      4096    /* number of disk inodes per iag */
 #define L2INOSPERIAG    12      /* l2 number of disk inodes per iag */
 #define INOSPEREXT      32      /* number of disk inode per extent */
 #define L2INOSPEREXT    5       /* l2 number of disk inode per extent */
 #define IXSIZE          (DISIZE * INOSPEREXT)   /* inode extent size */
 #define INOSPERPAGE     8       /* number of disk inodes per 4K page */
 #define L2INOSPERPAGE   3       /* log2(INOSPERPAGE) */
 
 #define IAGFREELIST_LWM 64
 
 #define INODE_EXTENT_SIZE       IXSIZE  /* inode extent size */
 #define NUM_INODE_PER_EXTENT    INOSPEREXT
 #define NUM_INODE_PER_IAG       INOSPERIAG
 
 #define MINBLOCKSIZE            512
 #define MAXBLOCKSIZE            4096
 #define MAXFILESIZE             ((s64)1 << 52)
 
 #define JFS_LINK_MAX            0xffffffff
 
 /* Minimum number of bytes supported for a JFS partition */
 #define MINJFS                  (0x1000000)
 #define MINJFSTEXT              "16"
 
 /*
  * file system block size -> physical block size
  */
 #define LBOFFSET(x)     ((x) & (PBSIZE - 1))
 #define LBNUMBER(x)     ((x) >> L2PBSIZE)
 #define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE))
 #define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE))
 /* size in byte -> last page number */
 #define SIZE2PN(size)   ( ((s64)((size) - 1)) >> (L2PSIZE) )
 /* size in byte -> last file system block number */
 #define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) )
 
 /*
  * fixed physical block address (physical block size = 512 byte)
  *
  * NOTE: since we can't guarantee a physical block size of 512 bytes the use of
  *       these macros should be removed and the byte offset macros used instead.
  */
 #define SUPER1_B        64      /* primary superblock */
 #define AIMAP_B         (SUPER1_B + 8)  /* 1st extent of aggregate inode map */
 #define AITBL_B         (AIMAP_B + 16)  /*
                                          * 1st extent of aggregate inode table
                                          */
 #define SUPER2_B        (AITBL_B + 32)  /* 2ndary superblock pbn */
 #define BMAP_B          (SUPER2_B + 8)  /* block allocation map */
 
 /*
  * SIZE_OF_SUPER defines the total amount of space reserved on disk for the
  * superblock.  This is not the same as the superblock structure, since all of
  * this space is not currently being used.
  */
 #define SIZE_OF_SUPER   PSIZE
 
 /*
  * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table
  */
 #define SIZE_OF_AG_TABLE        PSIZE
 
 /*
  * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of
  * the inode allocation map (to hold iag)
  */
 #define SIZE_OF_MAP_PAGE        PSIZE
 
 /*
  * fixed byte offset address
  */
 #define SUPER1_OFF      0x8000  /* primary superblock */
 #define AIMAP_OFF       (SUPER1_OFF + SIZE_OF_SUPER)
                                         /*
                                          * Control page of aggregate inode map
                                          * followed by 1st extent of map
                                          */
 #define AITBL_OFF       (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1))
                                         /*
                                          * 1st extent of aggregate inode table
                                          */
 #define SUPER2_OFF      (AITBL_OFF + INODE_EXTENT_SIZE)
                                         /*
                                          * secondary superblock
                                          */
 #define BMAP_OFF        (SUPER2_OFF + SIZE_OF_SUPER)
                                         /*
                                          * block allocation map
                                          */
 
 /*
  * The following macro is used to indicate the number of reserved disk blocks at
  * the front of an aggregate, in terms of physical blocks.  This value is
  * currently defined to be 32K.  This turns out to be the same as the primary
  * superblock's address, since it directly follows the reserved blocks.
  */
 #define AGGR_RSVD_BLOCKS        SUPER1_B
 
 /*
  * The following macro is used to indicate the number of reserved bytes at the
  * front of an aggregate.  This value is currently defined to be 32K.  This
  * turns out to be the same as the primary superblock's byte offset, since it
  * directly follows the reserved blocks.
  */
 #define AGGR_RSVD_BYTES SUPER1_OFF
 
 /*
  * The following macro defines the byte offset for the first inode extent in
  * the aggregate inode table.  This allows us to find the self inode to find the
  * rest of the table.  Currently this value is 44K.
  */
 #define AGGR_INODE_TABLE_START  AITBL_OFF
 
 /*
  *      fixed reserved inode number
  */
 /* aggregate inode */
 #define AGGR_RESERVED_I 0       /* aggregate inode (reserved) */
 #define AGGREGATE_I     1       /* aggregate inode map inode */
 #define BMAP_I          2       /* aggregate block allocation map inode */
 #define LOG_I           3       /* aggregate inline log inode */
 #define BADBLOCK_I      4       /* aggregate bad block inode */
 #define FILESYSTEM_I    16      /* 1st/only fileset inode in ait:
                                  * fileset inode map inode
                                  */
 
 /* per fileset inode */
 #define FILESET_RSVD_I  0       /* fileset inode (reserved) */
 #define FILESET_EXT_I   1       /* fileset inode extension */
 #define ROOT_I          2       /* fileset root inode */
 #define ACL_I           3       /* fileset ACL inode */
 
 #define FILESET_OBJECT_I 4      /* the first fileset inode available for a file
                                  * or directory or link...
                                  */
 #define FIRST_FILESET_INO 16    /* the first aggregate inode which describes
                                  * an inode.  (To fsck this is also the first
                                  * inode in part 2 of the agg inode table.)
                                  */
 
 /*
  *      directory configuration
  */
 #define JFS_NAME_MAX    255
 #define JFS_PATH_MAX    BPSIZE
 
 
 /*
  *      file system state (superblock state)
  */
 #define FM_CLEAN 0x00000000     /* file system is unmounted and clean */
 #define FM_MOUNT 0x00000001     /* file system is mounted cleanly */
 #define FM_DIRTY 0x00000002     /* file system was not unmounted and clean
                                  * when mounted or
                                  * commit failure occurred while being mounted:
                                  * fsck() must be run to repair
                                  */
 #define FM_LOGREDO 0x00000004   /* log based recovery (logredo()) failed:
                                  * fsck() must be run to repair
                                  */
 #define FM_EXTENDFS 0x00000008  /* file system extendfs() in progress */
 
 #endif                          /* _H_JFS_FILSYS */
 
